. >> secretary of state john kerry in afghanistan for talks with president hamid karzai. the session came shortly after the u.s. military ceded control of its last detention facility there. this is secretary kerry's sixth visit to the country since president obama became president but his first as secretary of state. secretarier the kerry also plans to meet with civic leaders and others to discuss continued u.s. assistance to the country. and coming up here on c-span2, a senate hearing on the threats of space debris and asteroids and what space agencies are doing about them. then a look at egypt's parliamentary elections next month. and that's followed by comcast ceo and president brian roberts on the future of cable and where technology is headed. the supreme court is hearing two cases this week dealing with same-sex marriage. today george washington university hosts a discussion of those cases with legal experts. you can see it live at 4 eastern over on c-span. and the oral arguments begin tomorrow with a challenge to california's proposition 8, a constitutional ban on